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Thermal conductivity modeling of water containing metal oxide nanoparticles

Journal of Central South University 2015年第3期22卷 1141-1145页

作者： ahmad azari Persian Gulf University Faculty of Oil Gas and Petrochemical EngineeringChemical Engineering Department

The nano particles have demonstrated great potential to improve the heat transfer characteristics of heat transfer *** parameters responsible for this increase were studied. The heat transfer profile in the nanolayer region was combined with other parameters such as volume fraction, particle radius thermal conductivity of the fluid, particle and nanolayer, to formulate a thermal conductivity model. Results predicting the thermal conductivity of nanofluids using the model were compared with experimental results as well as studies by other researchers. The comparison of the results obtained for the Cu O/water and Ti O2/water nanofluids studied shows that the correlation proposed is in closest proximity in predicting the experimental results for the thermal conductivity of a nanofluid. Also, a parametric study was performed to understand how a number of factors affect the thermal conductivity of nanofluids using the developed correlation.

关键词： nanofluid effective thermal conductivity nanoparticle nanolayer modeling

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An experimental comparison of water based alumina and silica nanofluids heat transfer in laminar flow regime

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Journal of Central South University 2013年第12期20卷 3582-3588页

作者： azari ahmad Kalbasi Mansour Derakhshandeh Masoud Depertment of Petrochemical Engineering Amirkabir University of Technology (Tehran Polytechnic)Mahshahr Campus

Experimental investigations were carried out to determine the Al2O3/water and SiO2/water nanofluids flowing through a circular tube. convective heat transfer performance and pressure drop of Measurements show that the addition of small amounts of nano-sized Al2O3 particles to the base fluid increases heat transfer coefficients considerably, while the result for the silica nanofluids contradicts with the alumina nanofluids and this leads to some interesting results. In the case of alumina nanofluids, an average increase of 16% in convective heat transfer coefficient is observed with an average penalty of 28% in pressure drop. Moreover, flow resistance increases significantly compared to the base fluid even at very low concentrations of nanofluids. Finally, measured heat transfer coefficients are compared with predicted ones from the correlation of Shah under the same conditions.

关键词： convection forced convection heat transfer nano scale heat transfer

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An Experimental Study on Nanofluids Convective Heat Transfer Through a Straight Tube under Constant Heat Flux

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Chinese Journal of Chemical Engineering 2013年第10期21卷 1082-1088页

作者： ahmad azari Mansour Kalbasi Masoud Derakhshandeh Masoud Rahimi Department of Petrochemical Engineering Amirkabir University of Technology (Tehran Polytechnic) MahshahrCampus Mahshahr EO. Box 415 Iran CFD-Research Center Chemical Engineering Department Razi University TagheBostan Kermanshah Iran

In this work, the laminar convective heat transfer performance and the pressure drop of water-based nanofluids containing Al2O3, TiO2 and SiO2 nanoparticles flowing through a straight circular tube were experimentally investigated. The experimental results showed that addition of small amounts of nano-sized Al2O3 and TiO2 particles to de-ionized water increased heat transfer coefficients considerably, while the SiO2 nanofluids showed the opposite behavior attracting the authors' interests. An average of 16% and 8.2% increase in heat transfer coefficient were observed with the average of 28% and 15% penalty in pressure drop for Al2O3 and TiO2 nanofluids.

关键词： convection Iorced convection heat transfer nanopartlcles nanotlulCls

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Spatio-temporal distribution of malaria vectors(Diptera:Culicidae) across different climatic zones of Iran

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Asian Pacific Journal of Tropical Medicine 2011年第6期4卷 498-504页

作者： ahmad Ali Hanafi-Bojd Shahyad azari-Hamidian Hassan Vatandoost Zabihollah Charrahy Department of Medical Entomology and Vector Control School of Public HealthTehran University of Medical SciencesTehranIran School of Health Guilan University of Medical SciencesRashtIran Department of Education Jehad-e-Daneshgahi of Tehran UniversityTehranIran

Malaria is a main vector-borne public health problem in *** last studies on Iranian mosquitoes show 31 Anopheles species including different sibling species and genotypes,eight of them are reported to play role in malaria *** objective of this study is to provide a reference for malaria vectors of Iran and to map their spatial and temporal distribution in different climatic *** files of administrative boundaries and climates of Iran were provided by National Cartographic *** on distribution and seasonal activity of malaria vectors were obtained from different sources and a databank in district level was created in Excel 2003, inserted to the shape files and analyzed by ArcGIS 9.2 to provide the *** culicifacies Giles s.l.,Anopheles dthali Patton,Anopheles fluviatilis James s.L,Anopheles maculipennis Meigen s.L,Anopheles sacharovi Favre,Anopheles stephensi IJston,and Anopheles superpictus Grassi have been introduced as primary and secondary malaria vectors and Anopheles puicherrimus Theobald as a suspected vector in *** distribution of anopheline mosquitoes is restricted to April_December in northern Iran,however mosquitoes can be found during the year in southern *** distribution of malaria vectors is different based on species,thus six of them(except for Anopheles maculipennis *** Anopheles sacharovi) are reported from endemic malarious area in southern and southeastern areas of *** climate of this part is usually warm and humid,which makes it favorable for mosquito rearing and malaria *** between climate conditions and vector distribution can help to predict the potential range of activity for each species and preparedness for malaria epidemics.

关键词： Anopheles Malaria Distribution GIS Iran

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